[rules-users] Issues Regarding use " Eval"

Hi all, I want to use "eval" in my rules, but in rule writing guidelines Mark has Written that "Eval is Evil". I want to compare the values of Hash Map in my when (conditions) part. 1) Will anyone suggest something so that I can compare Hash Map keys in when part? 2) Does is there any performance related issue related to "eval"; Regards Rajesh -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.